/*
 Copyright  2007 MySQL AB, 2008 Sun Microsystems
 All rights reserved. Use is subject to license terms.

  The MySQL Connector/J is licensed under the terms of the GPL,
  like most MySQL Connectors. There are special exceptions to the
  terms and conditions of the GPL as it is applied to this software,
  see the FLOSS License Exception available on mysql.com.

  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License as
  published by the Free Software Foundation; version 2 of the
  License.

  This program is distributed in the hope that it will be useful,  
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  02110-1301 USA
 
 */

package com.mysql.jdbc;

import java.sql.SQLException;
import java.sql.Savepoint;

/**
 * Implementors of this interface can be installed via the 
 * "connectionLifecycleInterceptors" configuration property and receive
 * events and alter behavior of "lifecycle" methods on our connection
 * implementation.
 * 
 * The driver will create one instance of a given interceptor per-connection.
 */
public interface ConnectionLifecycleInterceptor extends Extension {
	/**
	 * Called when an application calls Connection.close(), before the driver
	 * processes its own internal logic for close.
	 * 
	 * @throws SQLException
	 */
	public abstract void close() throws SQLException;
	
	/**
	 * Called when an application calls Connection.commit(), before the
	 * driver processes its own internal logic for commit().
	 * 
	 * Interceptors should return "true" if the driver should perform
	 * its own internal logic for commit(), or "false" if not.
	 * 
	 * @return "true" if the driver should perform
	 * its own internal logic for commit(), or "false" if not.
	 * 
	 * @throws SQLException if an error occurs
	 */
	public abstract boolean commit() throws SQLException;
	
	/**
	 * Called when an application calls Connection.rollback(), before the
	 * driver processes its own internal logic for rollback().
	 * 
	 * Interceptors should return "true" if the driver should perform
	 * its own internal logic for rollback(), or "false" if not.
	 * 
	 * @return "true" if the driver should perform
	 * its own internal logic for rollback(), or "false" if not.
	 * 
	 * @throws SQLException if an error occurs
	 */
	public abstract boolean rollback() throws SQLException;
	
	/**
	 * Called when an application calls Connection.rollback(), before the
	 * driver processes its own internal logic for rollback().
	 * 
	 * Interceptors should return "true" if the driver should perform
	 * its own internal logic for rollback(), or "false" if not.
	 * 
	 * @return "true" if the driver should perform
	 * its own internal logic for rollback(), or "false" if not.
	 * 
	 * @throws SQLException if an error occurs
	 */
	public abstract boolean rollback(Savepoint s) throws SQLException;
	
	/**
	 * Called when an application calls Connection.setAutoCommit(), before the
	 * driver processes its own internal logic for setAutoCommit().
	 * 
	 * Interceptors should return "true" if the driver should perform
	 * its own internal logic for setAutoCommit(), or "false" if not.
	 * 
	 * @return "true" if the driver should perform
	 * its own internal logic for setAutoCommit(), or "false" if not.
	 * 
	 * @throws SQLException if an error occurs
	 */
	public abstract boolean setAutoCommit(boolean flag) throws SQLException;
	
	/**
	 * Called when an application calls Connection.setCatalog(), before the
	 * driver processes its own internal logic for setCatalog().
	 * 
	 * Interceptors should return "true" if the driver should perform
	 * its own internal logic for setCatalog(), or "false" if not.
	 * 
	 * @return "true" if the driver should perform
	 * its own internal logic for setCatalog(), or "false" if not.
	 * 
	 * @throws SQLException if an error occurs
	 */
	public abstract boolean setCatalog(String catalog) throws SQLException;
	
	/**
	 * Called when the driver has been told by the server that a transaction
	 * is now in progress (when one has not been currently in progress).
	 */
	public abstract boolean transactionBegun() throws SQLException;
	
	/**
	 * Called when the driver has been told by the server that a transaction
	 * has completed, and no transaction is currently in progress.
	 */
	public abstract boolean transactionCompleted() throws SQLException;
}
